Respuesta :

isaacdeyarmin95

Answer:

x^2+9x+20.25=5.25

Step-by-step explanation:

a^2+ba+c; x^2+9x+15=0; x^2+9x+15-15=0-15; x^2+9x=-15; then you you take (1/2b)^2 and add it to both sides, 4.5^2=20.25; x^2+9x+20.25=-15+20.25; x^2+9x+20.25=5.25

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